compositions



I06. COMPOSITIONS,

COATING OR PLASTIC.

PATENT OFFICE;

H ER) X I\' 'I\"I I"l"l.\Ii\ XX. OF ESCHERSHAUSTIN, YERUXSW'IGK, GERMAXY.

PROCESS OF MANUFACTURING ASPHALTIC POWDER SUITABLE FOR PAVING.

SPECIFICATION Zorming part of Letters Patent No. 310,594, dated January 13, 1885.

Application liled September :12, I9 4. (Yo specimens.) lalented in England September I5, 1994. No. i i-1'13.

To all whom it may concern.-

Be it known that l, HERMAN ii trrmniNN, a subject of the Duke of Anhalt, residing at Eschershausen, in the dukedom of Brunswick, German Empire, have invented certain new and useful lmprovements in the Process of ,llanui'znrturing A sphaltic .lowder Suitable for Paving; and I do hereby declare the following 7 to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and i use the same.

permeable substances-snclFaS nous substances or with a combination of these, do not permit of that intimate and uniform impregnation or coating of the materials required for the purposes intended.

This invention has for its obiecl In i-ll'ecl. the intimate combination, either by impregnation substances with the permeable and impermeable substances; and it consists, essentially, in reducing the permeable or impermeable substances, or a combination of such, by ad mixture of water to a fluid magma, and then mixing therewith, under the influence of heat, the bituminous substance or substances. It is obvious that the bituminous substance or substances according to this process will more readily, completely, and intimately impregnate or envelop the particles of the permeable or impermeable substances, owing to their suspension in water. as that which results from the pouring of a hydrocarbon into water,'the heat-ed bituminous substance spreading over the entire surface of the particles of the permeable or im w 7 r m -i, "Istonc, and oth'r' or with impermeable substancessucli as sand, glass, &c.and bitumicentigrade in asuitable vessehp'fov'i ded with heated to the stated temperature, and while or coating of the bituminous substance or f from the foreign constituent-s a- The effect is the same- I the same from its earthy constituents by the admixture of ahydrocarbonsuch as the resi: dues of petroleum or other suitable hydro- 5 carbon-and reducing the mixture by heat to such a state of flnidityto permit of the sub! sidenee or precipitation of such foreign con stitucnts as are detrimental to its binding properties. The volume of hydrocarbon add-i ed to the asphaltum or'bituminous substance should be so regulated that at a temperature varying from 17 to 3 centigrade the mixture will be stringythat is to say, when hair, dled it will draw out into strings-the heat-'65 iug after subsidence of the foreign matter referred to being continued until the hydrocarbo n is driven out and the bituminousjubstance is of the proper consistency. The limerock or the asphaltic rock, poor in asphaltum or bitumenfismdand converted into, a fluid magma by the admixture of about forty} per cent. of water, and heated to about 50 stirrers. \Vhen ll 1 e rock magma has been being agitated, tlmbituminous substance, freed 1 forth, and heated to about centigrade, is gradually added to the rock magma, the im; prcgnation or covering of the particles taking place almost instantaneously. Du'rin the successive mixing of the mass it is kept at th a r proper Kimmie addition of water hit ed to about 60 o r -Tb centigrade. The. 8 proportion'of the bituminous matter relatively to that of the rock magma may be varied within certain limits, and may reach fifteen per cent; of the dry pulvcrulent matter. The homogeneous mass so obtained may then be converted into blocks or bricks, either while yet hot or warm or after cooling, which blocks or bricks are then air-dried; or the fluid hot compound maybe spread over a flat porous bed and then cut up into blocks, bricks, or 9 pieces. The air dried asphalt concrete is finally subjected to a temperature of about 116 ceutigrade in suitable retorts for the purpose of driving out the last traces of water and eiTccting the most intimate incorporation possible of the component parts without decomposing the bituminous IDELiiII-CI'. Vhen cold, the bituminous blocks or bricks are pulverized and ready for use.

lCO

it is obvious that in lieu of the lime-rock I 2. lhe herein-described process of producor asphaltic rock other pulverized material or ing asphaltic or bituminous concretes, which artificial materials may be employed, and the consists in reducing the pulverized rock or product obtained may be converted intoblocks, othemgmeable r impermeable material into bricks, tiles, 0r flags for paving and roofing 5 the addition of water, heatingthe purposes.

Having thus particularly described my invention, whatI claim, and desire to secureby Letters Patent, is-

1. The herein-described process of produci a magma y same, mixing therewith heated asphaltum or i bitumen, and expelling the water from the i product, as set forth.

' In testimony whereof I aflix my signature in presence of two witnesses.

ing asphaltic or bituminous concretes, which consists in mixing the asphaltum or bitumen with pulverized permeable or impermeable l materials while the latter are held in suspension in water or while in the condition of magma by the admixture therewith of water. i

HERMAN)? KETTMANN.

\\'i tuesses:

ADOLF Dam-anus, B. Roi. 

